具有突发性剑突下阵发性钻顶样剧烈疼痛症状的病症是

A．胆囊结石

B．胆管结石

C．胆囊癌

D．胆管癌

E．胆道蛔虫

Radiation spreads a fire by（）.

A.transferring heat across an unobstructed space

B.heated gases flowing through ventilation systems

C.burning liquids flowing into another space

D.transmitting the heat of a fire through the ship's metal